GRB 110708B

S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
D. Svinkin, and T. Cline on behalf of the Konus-Wind team,

K. Hurley on behalf of the Mars Odyssey and MESSENGER GRB teams,

J. Goldsten on behalf of the MESSENGER GRNS GRB team,

J. Cummings, D. Palmer, S. Barthelmy, N. Gehrels, and H. Krimm, on
behalf of the Swift-BAT team,

and

A. von Kienlin, X. Zhang, and A. Rau, on behalf of the
INTEGRAL SPI-ACS GRB team, report:

On 2011 July 8 at about 13:59:46 UT, an extremely intense, long duration 
GRB was observed by Konus-Wind, INTEGRAL (SPI-ACS), MESSENGER, and Swift 
(BAT) (outside the coded field of view).  We have triangulated it to the 
following 3 sigma error box:
  -----------------------------------------------
    RA(2000), deg              Dec(2000), deg
-----------------------------------------------
Center:
  170.382 (11h 21m 32s)   -50.569 (-50d 34' 09")
Corners:
  170.638 (11h 22m 33s)   -50.604 (-50d 36' 14")
  169.949 (11h 19m 48s)   -50.926 (-50d 55' 34")
  170.126 (11h 20m 30s)   -50.534 (-50d 32' 02")
  170.810 (11h 23m 14s)   -50.209 (-50d 12' 32")
-----------------------------------------------

The error box area is 489 sq. arcmin.
The maximum distance between the box corners is 0.9 deg.
This error box may be improved.

S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:

The long bright GRB 110708B
(localized by IPN: Golenetskii et al., GCN 12150
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triggered Konus-Wind at T0=50386.394s UT (13:59:46.394)

The burst light curve consists of three main pulse groups,
with a total duration of ~60 s.
The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB110708_T50386/

As observed by Konus-Wind the burst
had a fluence of (9.4 � 0.9)x10-5 erg/cm2,
and a 64-ms peak flux, measured from T0+12.288 s,
of (4.0 � 0.5)x10-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-integrated spectrum of the burst
(measured from T0 to T0+47.616 s) is best fitted
in the 20 keV - 10 MeV range by the GRB (Band)
model, for which:
the low-energy photon index alpha = -0.78 (-0.08, +0.08),
the high energy photon index beta = -2.4 (-0.2, +0.15),
the peak energy Ep = 294(-28, +30) keV,
chi2 = 67.8/84 dof.

The spectrum at the maximum count rate
(measured from T0+12.544 to T0+12.580 s) is best fitted
in the 20 keV - 10 MeV range by the GRB (Band)
model, for which:
the low-energy photon index alpha = -0.55 (-0.12, +0.14),
the high energy photon index beta = -3.3 (<-2.9),
the peak energy Ep = 586(-81, +97) keV,
chi2 = 33.3/47 dof.
This spectrum is equally well fitted
by a power law with exponential cutoff model, for which
alpha = -0.59 (-0.07, +0.07),
and Ep = 617(-69, +82) keV,
chi2 = 34.2/48 dof.

All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.